/*
* hid.c -- HID Composite driver
*
* Based on multi.c
*
* Copyright (C) 2010 Fabien Chouteau <fabien.chouteau@barco.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/usb/composite.h>
#include "gadget_chips.h"
#define DRIVER_DESC "HID Gadget"
#define DRIVER_VERSION "2010/03/16"
/*-------------------------------------------------------------------------*/
#define HIDG_VENDOR_NUM 0x0525 /* XXX NetChip */
#define HIDG_PRODUCT_NUM 0xa4ac /* Linux-USB HID gadget */
/*-------------------------------------------------------------------------*/
/*
* kbuild is not very cooperative with respect to linking separately
* compiled library objects into one module. So for now we won't use
* separate compilation ... ensuring init/exit sections work to shrink
* the runtime footprint, and giving us at least some parts of what
* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
*/
#include "f_hid.c"
struct hidg_func_node {
struct list_head node;
struct hidg_func_descriptor *func;
};
static LIST_HEAD(hidg_func_list);
/*-------------------------------------------------------------------------*/
USB_GADGET_COMPOSITE_OPTIONS();
static struct usb_device_descriptor device_desc = {
.bLength = sizeof device_desc,
.bDescriptorType = USB_DT_DEVICE,
.bcdUSB = cpu_to_le16(0x0200),
/* .bDeviceClass = USB_CLASS_COMM, */
/* .bDeviceSubClass = 0, */
/* .bDeviceProtocol = 0, */
.bDeviceClass = USB_CLASS_PER_INTERFACE,
.bDeviceSubClass = 0,
.bDeviceProtocol = 0,
/* .bMaxPacketSize0 = f(hardware) */
/* Vendor and product id can be overridden by module parameters. */
.idVendor = cpu_to_le16(HIDG_VENDOR_NUM),
.idProduct = cpu_to_le16(HIDG_PRODUCT_NUM),
/* .bcdDevice = f(hardware) */
/* .iManufacturer = DYNAMIC */
/* .iProduct = DYNAMIC */
/* NO SERIAL NUMBER */
.bNumConfigurations = 1,
};
static struct usb_otg_descriptor otg_descriptor = {
.bLength = sizeof otg_descriptor,
.bDescriptorType = USB_DT_OTG,
/* REVISIT SRP-only hardware is possible, although
* it would not be called "OTG" ...
*/
.bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
};
static const struct usb_descriptor_header *otg_desc[] = {
(struct usb_descriptor_header *) &otg_descriptor,
NULL,
};
/* string IDs are assigned dynamically */
static struct usb_string strings_dev[] = {
[USB_GADGET_MANUFACTURER_IDX].s = "",
[USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
[USB_GADGET_SERIAL_IDX].s = "",
{ } /* end of list */
};
static struct usb_gadget_strings stringtab_dev = {
.language = 0x0409, /* en-us */
.strings = strings_dev,
};
static struct usb_gadget_strings *dev_strings[] = {
&stringtab_dev,
NULL,
};
/****************************** Configurations ******************************/
static int __init do_config(struct usb_configuration *c)
{
struct hidg_func_node *e;
int func = 0, status = 0;
if (gadget_is_otg(c->cdev->gadget)) {
c->descriptors = otg_desc;
c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
}
list_for_each_entry(e, &hidg_func_list, node) {
status = hidg_bind_config(c, e->func, func++);
if (status)
break;
}
return status;
}
static struct usb_configuration config_driver = {
.label = "HID Gadget",
.bConfigurationValue = 1,
/* .iConfiguration = DYNAMIC */
.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
};
/****************************** Gadget Bind ******************************/
static int __init hid_bind(struct usb_composite_dev *cdev)
{
struct usb_gadget *gadget = cdev->gadget;
struct list_head *tmp;
int status, funcs = 0;
list_for_each(tmp, &hidg_func_list)
funcs++;
if (!funcs)
return -ENODEV;
/* set up HID */
status = ghid_setup(cdev->gadget, funcs);
if (status < 0)
return status;
/* Allocate string descriptor numbers ... note that string
* contents can be overridden by the composite_dev glue.
*/
status = usb_string_ids_tab(cdev, strings_dev);
if (status < 0)
return status;
device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
/* register our configuration */
status = usb_add_config(cdev, &config_driver, do_config);
if (status < 0)
return status;
usb_composite_overwrite_options(cdev, &coverwrite);
dev_info(&gadget->dev, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
return 0;
}
static int __exit hid_unbind(struct usb_composite_dev *cdev)
{
ghid_cleanup();
return 0;
}
static int __init hidg_plat_driver_probe(struct platform_device *pdev)
{
struct hidg_func_descriptor *func = pdev->dev.platform_data;
struct hidg_func_node *entry;
if (!func) {
dev_err(&pdev->dev, "Platform data missing\n");
return -ENODEV;
}
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return -ENOMEM;
entry->func = func;
list_add_tail(&entry->node, &hidg_func_list);
return 0;
}
static int hidg_plat_driver_remove(struct platform_device *pdev)
{
struct hidg_func_node *e, *n;
list_for_each_entry_safe(e, n, &hidg_func_list, node) {
list_del(&e->node);
kfree(e);
}
return 0;
}
/****************************** Some noise ******************************/
static __refdata struct usb_composite_driver hidg_driver = {
.name = "g_hid",
.dev = &device_desc,
.strings = dev_strings,
.max_speed = USB_SPEED_HIGH,
.bind = hid_bind,
.unbind = __exit_p(hid_unbind),
};
static struct platform_driver hidg_plat_driver = {
.remove = hidg_plat_driver_remove,
.driver = {
.owner = THIS_MODULE,
.name = "hidg",
},
};
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Fabien Chouteau, Peter Korsgaard");
MODULE_LICENSE("GPL");
static int __init hidg_init(void)
{
int status;
status = platform_driver_probe(&hidg_plat_driver,
hidg_plat_driver_probe);
if (status < 0)
return status;
status = usb_composite_probe(&hidg_driver);
if (status < 0)
platform_driver_unregister(&hidg_plat_driver);
return status;
}
module_init(hidg_init);
static void __exit hidg_cleanup(void)
{
platform_driver_unregister(&hidg_plat_driver);
usb_composite_unregister(&hidg_driver);
}
module_exit(hidg_cleanup);
